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- 2 sheets-sheet 1. C. A. `KNIGHT' 8u G-. W- THODE. STEAM GENERATOR.

.No'. 546,119. l Patented Sept. 10, 1895.

(No Model.)

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(No Model.)

' 2` .Sheets-Sheet 2. C. A. KNIGHT & G. W. THODE'.

STEAM GENERATOR.

1\r0.546,119. Patentedl sept. 1o, 18915.

section on line @c of Fig. 1.

CHARLES ALBERT KNIGHT AND GEORGE VILLIAM THODE, OF GLASGOV,

SCOTLAND.

sTEAivi-GENneuron.'

SPECIFICATION forming part of Letters Patent N o. 546,119, dated September 10, 1895.

Application filed August 3, 1894. Serial No. 519,330. (No model.) Patented in England February 16,189S,No. 3,456; in Belgum October 25, 1893, No. 106,913, and in France October 29,1893,No. 233.632.

T0 all whom it may concern:

Be it known that we, CHARLES ALBERT KNIGHT, a citizen of the United States, and GEORGE WILLIAM THonn, a subject of the Emperor of Germany, residing in Glasgow, county of Lanark, Scotland, have jointly `invented a new and useful Improvement in Stearn- Generators, (for which we have received patents in Great Britain, No. 3,456, dated February 16, 1893; in Belgium, No. 106,013, dated October 25, 1893, and in France, No. 233,632, dated October 29, 1893,) of which the following is a specification.

Thisinvention has for its objects, by the di- Vision of the combustion-chamber or furnace of the boiler into compartments and the special arrangementv of certain boiler-tubes, to insure more complete combustion of the fuel used in the furnace and the better utilization of the heat generated, as well as to secure the absence of smoke, which objects are attained by the organization and arrangements he-reinat'ter described and claimed.

Referring to the accompanying drawings, Figure 1 shows a vertical longitudinal section of the f urnace and walls of the boiler-setting with a sectional tubular boiler in side elevation. Fig. 2 represents a vertical transverse Fig. 3 shows a horizontal section of the boiler front on line fz/ y of Fig. 1.

The main series or stack of inclined watertubes A are situated over the furnace B or within the combustion-chamber C and are connected at each end to headers D E, respectively, which are in turn connected to a steam and water drum or reservoir F in the usual manner. To this main stack of tubes are added one or more rows of tubes A, (one row being shown in the drawings,) which additional tubes are placed in a lower plane than 'the stack, separated therefrom by a considerable space and preferably inclined at a less angle of elevation. At the front the tubes A are connected to a header d, nippled and connected by straight or bent tubes d to the main headers D, and at the rear are connected to a header or drum c, nippled to the` main rear headers E 5 but, if desired, the tubes may be connected at the front and rear ends dithrough which the collected sediment can be discharged,in addition to the function of the mud-drum H and blow-off pipe h.

Over or upon the row or series of tubes A there is built or formed of bricks, tiles, or other suitable material a roof G, which extends nearly the whole length of the furnace B and preferably rests upon the tubes A', so 65 as to be partially supported thereby. This roof divides the combustion-chamber into two parts-an upper c and a lower c-and causes the heat from the fire to be first utilized to convert into steam the Water circulating through the tubes A. the tubes A and under side of the roof G, by which latter it is deflected, so as to travel nearly the whole' length of such portions of the tubes as are in the lower chamber when it passes around the roof through the opening b and into the upper chamber, where it acts upon the main stack of tubes A. In this upper chamber c the Volatile gases become thoroughly mixed with air admitted through the fuel or through an opening g, Figs. 1 and 3, in the front wall of thesetting, or both, and such gases being consumed part with their heat to the water circulating in the stack of tubes A. If desired, an additional roof-section 7u may be placed upon the lower row of the stack of tubes A, extending forward from the bridge-wall a sufficient distance to direct the gases to the forward end of the stack, and

The direct heat impinges upon the roof G may extend from the bridge F to- 9o ICO The arrangements hereinbefore described not only secure a greater utilization of the heat generated by the fire, but insure more perfect combustion, thereby reducing the amount of smoke, all reducing to a minimum the quantity of soot that desposits upon the main boiler or stack of tubes.

What We claim, and desire to secu rc by Letters Patent, is-

l. In a steanrgenerator, a main boiler or stack of tubes; a series of auxiliary tubes in circulatory connection therewith located beneath the same and in direct contact with the ames in the furnace; and a roof partially overlying those portions of said auxiliary tubes that are Within the furnace and dividing the furnace into two vertically-connected parts, substantially as set forth.

2. In a steam-generator, a main boiler or 

